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CS2200-OT Datasheet(PDF) 11 Page - Cirrus Logic |
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CS2200-OT Datasheet(HTML) 11 Page - Cirrus Logic |
11 / 23 page CS2200-OTP DS842F3 11 5.3 Output to Input Frequency Ratio Configuration 5.3.1 User Defined Ratio (RUD) The User Defined Ratio, RUD, is a 32-bit un-signed fixed-point number which determines the basis for the desired input to output clock ratio. Up to four different ratios, Ratio 0-3, can be stored in the CS2200’s one time programmable memory. Selection between the four ratios is achieved by the M[1:0] mode select pins. The 32-bit RUD is represented in a 12.20 format where the 12 MSBs represent the integer binary portion while the remaining 20 LSBs represent the fractional binary portion. The maximum multiplication factor is approximately 4096 with a resolution of 0.954 PPM in this configuration. See “Calculating the User Defined Ratio” on page 20 for more information. The status of internal dividers, such as the internal timing reference clock divider, are automatically taken into account. Therefore RUD is simply the desired ratio of the output to input clock frequencies. 5.3.2 Ratio Modifier (R-Mod) The Ratio Modifier is used to internally multiply/divide the currently addressed RUD (Ratio0-3 stored in the register space remain unchanged). The available options for R-Mod are summarized in Table 2 on page 11. R-Mod is enabled via the M2 pin in conjunction with the appropriate setting of the M2Config[2:0] global parameter (see Section 5.6.2 on page 15). Table 2. Ratio Modifier 5.3.3 Effective Ratio (REFF) The Effective Ratio (REFF) is an internal calculation comprised of RUD and the appropriate modifiers, as previously described. REFF is calculated as follows: REFF = RUD R-Mod To simplify operation the device handles some of the ratio calculation functions automatically (such as when the internal timing reference clock divider is set). For this reason, the Effective Ratio does not need to be altered to account for internal dividers. Ratio modifiers which would produce an overflow or truncation of REFF should not be used. In all cases, the maximum and minimum allowable values for REFF are dictated by the frequency limits for both the input and output clocks as shown in the “AC Electrical Characteristics” on page 7. Referenced Control Parameter Definition Ratio 0-3................................“Ratio 0 - 3” on page 18 M[1:0] ....................................“M1 and M0 Mode Pin Functionality” on page 14 RModSel[1:0] R Modifier 00 0.5 01 0.25 10 0.125 11 0.0625 Referenced Control Parameter Definition Ratio 0-3................................“Ratio 0 - 3” on page 18 RModSel[1:0] ........................“R-Mod Selection (RModSel[1:0])” section on page 17 M2Config[2:0]........................“M2 Pin Configuration (M2Config[2:0])” on page 19 |
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